Stop-motion device.



L VON SAZENHOPEN.

STOP MOTION DEVICE. APPLICATION FILED JAN. 29, mm.

Patented Dec. 8, i914.

P JEENT @FFMJE.

LUIDWIG VON SAZENHDFEN, OF NUREMZBERG, GERMANY.

sror-r'corion DEVICE.

Specification of Letters Patent.

Patented Dec. 8,1914.

flriginal application filed August 30, 1911, Serial No. 646,933. Divided and this application filed January 29, 1914. Serial No. 815,175.

To all whom it may concern:

Be it known that I, Loowlc VON Saznx- HOIEN, a subject of the Emperor of Ger many, residing at Nuremberg, Bavaria,

Germany, have invented certain new and useful improvements in Stop-Motion Devices, of which the following is a specification.

The object of the present invention is a 19 device for automatically stopping the operation of sheet metal printing machines as described in my Patent No. 1,089,2T-t, from Which this case has been divided out, when the metal sheets are incorrectly fed into the machine. As in the knou/n device of this kind applicant uses stops which are conductively connected with in. source of electricity in such a manner that the operation of the machine is automatically stopped it go the work is not in contact with all of said stops. The stop motion device according to the present invention dili'ers From the known devices of this kind by the fact, that the stops are arranged within the print ing cylinder in juxtaposition to the front marks thereof and are connected by means of contacts with a stopping mechanism on the outside of the cylinder of well known construction, in such :1 manner that the so stops, when closing the ircuit. extend slightly above said front marks and positively actuate the stopping mechanism of the machine in case the metal sheets are not resting perfectly correct upon said marks.

Another advantage obtained by the device according to the present invention is to be seen in the fact that the trout marks are arranged upon the same shaftand operate therefore simultaneously.

In the accompanying drawing: Figures 1 and 2 are CI'OSS-SUCilUIlS through the device in diliercnt positions. Fig. 3 is a front elevation of the same.

The machine with which the device is to used, comprises as customary two revolvcylinders l and 2. the former of which grips the nut-omatically ted metal shoot t by means of the grippers t provided with 5!? marks l and secured to the rocking spindle 3 and pulls the sheets c between hath cylinders.

in order to auton'iatically stop the machine one of the sheets should rot be correctly fed into the cylinder. the following device is provided: On the spindle 3 carrying the grippers -l with their front marks r, is secured a contact 5 on the end of which the stop or abutment 8 is pivotally mounted by means of the spindle 7, said abutment carrying a second contact 10. Both contacts are caused to approach each other by a spring 11. On the cylinder 1 is secured a brush contact 12 which is temporarily brought into contact with the brush contact 1' secured to the frame of the machine 13. By this means it is possible during a certain period of the revolution of the cylinder to electrically connect and,disconnect the stop device from time to time. The brush contact 14 could also be a brush ring in which case the electrical connection would be a permanent one. lVhen the sheet 6 is placed in position, the stop 8 is depressed against the action of the spring 11 until the sheet is fully and evenly resting upon the front marks l" so that the contacts 5 and 10 are caused to movi apart. If, however, the sheets 6 were to assume an incorrect position, for instance an oblique one, so that only one or none of the stops 8 is depressed, then the two contacts 5 and 10 remain closed thus causing the stopping of the machine.

From a source of supply 15, the electric current passes over the stationary contact Ll to the contact l2, thence to the cont-act screw 10ovcrthc point of break to the contact screw 5. and thence back over the contacts 12 and H to the sliding brush 1(3 and by way of the Contact 18 sccured to the revolving disk 17, to the brush 1!), and thence to the releasing magnet '20 and back to the source of current 1 It a releasing armature is arranged in front of the magnet 20, then the machine will be brought to a standstill by this means. ii the circuit is not broken by the contact screws 5 and 10, the circuit is not broken when the stops 8 are not deprossod owing to the sheets assuming an incorrect position as it does not truly rest upon the l'ront marks l.

The cylinder 1 performs a full revolution while the revolving disk executes one-half revolution. The cylinder 1 after assuming its original position. rests until the revolving disk 17 executes its half revolution. During this time the printing carriage 1S thrown backward so that during its following return movement. it can print upon the next sin-ct. 'lhcreloro the contacts 5 and '10 arc always cooperating with the contact 18 in such a manner that the circuit is only closed When the cylinder is in position to grip the sheet 6 so that the machine is stopped, if the sheet 6 does not open the circuit by depressing the stop 8. The device as described can also be used with equal advantage in paper printing presses.

I claim:

1. Stopping device for printing machines comprising in combination, a printing cylinder, front marks upon said cylinder, stops Within said cylinder in juxtaposition to the front marks thereof, a connection for the shafts of said stops and front marks and means for electrically connecting said stops Withthe stopping mechanism of the ma chine.

2. Stopping device for printing machines comprising in combination, a printing cyl inder, grippers upon said cylinder, front marks upon said grippers, a rocking spindle to Which said grippers are secured, stops Within said cylinder in juxtaposition to the front marks thereof, shafts for said stops and for said front marks, said stops adapted to be depressed by a sheet When evenly resting upon said front marks, a connection for the shafts of said stops and front marks, and contacts upon said spindle and said stops within said cylinder, a shaft for said stops, a second shaft, grippers and front l marks upon said shaft and .a bearing for said stops upon said first named shaft forming a contact for a normally closed circuit adapted to be operated upon the correct introduction of a sheet'to be printed upon evenly depressing said stop and resting upon said front marks for breaking said circuit and means for actuating the stopping mechanism of the machine if said sheet isincorrectly introduced and said circuit is not broken.

In testimony whereof I afix my signature in presence of two Witnesses.

' LUDl VIG VON SAZENHOFEN. Vitnesses:

A. HnnRLnN, H. KREHM. 

